Improvement in the mode of balancing shafts



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` N.FETERS. PHOTDUTHOGRAFHER. WASHINGTUN D C aifti dita/e HENRY MAARTINSON, OF HAWKSVILLE, CANADA.

Letters Patent No. 110,259, dated December 20, 1870.

IMPROVEMENT IN THE'MQDE O F BALNCING HAFTS.

The Schedule referred to in these Letters Patent a'nd making part o! the lame.

To all whom e't may lconcern.

Be it 'knowntbat I, HENRY MARTINSON, of Waterloo, in the `Province of Ontario and Dominion of Canada, 'have invented a new and improved Balance for Shafting, Cylinders, 85e.; and I do hereby declare that the following is a fu'll, clear, and -exact description thereof, which willenable others skilled in the art to make andnse the same, reference being had to the accompanying drawing vforming part ot' this' specification, in which.-

Figure l'represents plan view, partly in section, of myinvention. j Figure 2 is a transverse section of the saine, xx being the section-line.

Similar` letters of reference indicate corresponding parts.

This invention has for its object so to hang and balance shafting, drums, cylinders, and other rotary machinery, that the saine may be properly tested while running, to ascertain whether the center of gravity is properly distributed along their axes.

The chief difficulty hitherto experienced in balancing cylindrical rotary bodies consists in the disproportionate inequality at the opposite ends of the cylinder, the balancing of one end leaving the other end, and thereby the entire body, usuallyasinaccurate as though not at all balanced. 4

My invention overcomes this ditcnlty by providing for the simultaneous balancing of both ends, and thereby the entire body of the cylinder. l

My invention consists in the application of yielding bearings for both ends ofthe cylindrical body to be balanced, and in the connection therewith of a jointed driving-shaft, which will allow the adjustment and oscillation of the driven end of said cylinder.

c a are the journal-boxes or bearings for the two ends of the shaft A, that carries the cylinder or drum B, or other heavy rotating device to be tested.

Each of said bearings or boxes a is arranged between four, more or less,- springs or cushions, ,0 C.

These' springs are made ot' coiled rn tali' or other suitable material, and are secured in the stationary frame D, and disposed around l,the bearings to evenly balance the saine between them.

.The drum, cylinder, or other. weight on the shaft,

will, if unevenly balanced or weighted, so .as to be heavier on one side 'than on the other, at one or both ends, cause the oscillating movement of the said cylinder in and with its bearings, the springs yielding to such motion.

The amount of oscillation can be readily ascertained at either end by a pencil, chalk, or other marker, and the balance adjusted in accordance with such marks.

The shaft A is, by universal joints b b, connected with the driving-shaft E, whereby that end of the cylinder to which the power is applied will be allowed to swing as well'as its' other end,

Having thus described m-y invention, A I claim as new and desire to secure by Letters Patent- The balance for cylindrical bodies, composed of the Witnesses WILLIAM Braccia, J. HUGHES, 

